Expectation: localhost:3000 works under ip.ip.ip.ip/folder

Reality: ip.ip.ip.ip/folder opens, but contains ip.ip.ip.ip/css/style.css and same for JS and so on links.

Goal: something (apache conf?) rewrites the stuff in such a way that all the links are ip.ip.ip.ip/folder/css/style.css and JS and so on.

It seems like it should work as the localhost:3000 is not using relatives URLs, but somehow it doesn't.

What am I not understanding and how can I fix it?


<VirtualHost *:80>
        ServerAdmin webmaster@localhost

        DocumentRoot /var/www
        <Directory />
                Options FollowSymLinks
                AllowOverride None
        <Directory /var/www/>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride None
                Order allow,deny
                allow from all

        ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
        <Directory "/usr/lib/cgi-bin">
                AllowOverride None
                Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
                Order allow,deny
                Allow from all

        RewriteEngine On
        RewriteLog "/var/log/apache2/rewrite.log"
        RewriteLogLevel 3
        RewriteRule ^/folder/(.*)$$1 [L,P]
        ProxyPassReverse /folder/

        ErrorLog ${APACHE_LOG_DIR}/error.log

        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog ${APACHE_LOG_DIR}/access.log combined

Loaded apache modules (probably a few too many, I've tried a whole bunch of things):

core_module (static)
log_config_module (static)
logio_module (static)
version_module (static)
mpm_prefork_module (static)
http_module (static)
so_module (static)
alias_module (shared)
auth_basic_module (shared)
authn_file_module (shared)
authz_default_module (shared)
authz_groupfile_module (shared)
authz_host_module (shared)
authz_user_module (shared)
autoindex_module (shared)
cgi_module (shared)
deflate_module (shared)
dir_module (shared)
env_module (shared)
mime_module (shared)
negotiation_module (shared)
php5_module (shared)
proxy_module (shared)
proxy_html_module (shared)
proxy_http_module (shared)
reqtimeout_module (shared)
rewrite_module (shared)
setenvif_module (shared)
status_module (shared)
substitute_module (shared)


Rewritelog output:

(2) init rewrite engine with requested uri /folder/
(3) applying pattern '^/folder/(.*)$' to uri '/folder/'
(2) rewrite '/folder/' -> ''
(2) forcing proxy-throughput with
(1) go-ahead with proxy request proxy: [OK]
(2) init rewrite engine with requested uri /css/style.css
(3) applying pattern '^/folder/(.*)$' to uri '/css/style.css'
(1) pass through /css/style.css


Found a couple of good resources and solutions:

Still struggling with it not rewriting the URLs inside CSS though.


There really is no need to use mod_rewrite to do the proxying here ProxyPass /folder/ http://localhost:3000/ will be entirely sufficient.

For the css/js/image problem you have a few options. By far the best is to change the underlying application so that is deplyos as '/folder/' rather than '/', then you can just use

ProxyPass /folder/ http://localhost:3000/folder/

And it should all just work, application, css etc all coverd by a single directive. If you cannot do this, then you can use things like ProxyPass /css/ http://localhost:3000/css/, but of course you need to do it for each folder used.

Finally you can upgrade to apache v2.4 and use mod_proxy_html to 'correct' the URI paths in the HTML/css/js directly.

  • Ah, the second option is clever - I never understood it before, but it would indeed work. The whole reason for doing is that I will have several applications running on that server that I want to expose under various paths. – LauriK Sep 23 '16 at 15:32

You seem to have some misconceptions about ProxyPassReverse and Rewrite Rules. This should work for you:

RewriteEngine on
RewriteRule ^/folder/(.*)$ http://localhost:3000/$1 [L,P]
ProxyPassReverse /folder/ http://localhost:3000/
  • It should, but does not. I've amended the configuration and appended the rewritelog output to the post. – LauriK Sep 23 '16 at 9:48

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